It's a good idea to have 1 main site location. Whether it is http://www.seocactus.com/ or http://seocactus.com/, when launching your site you should choose one and stick to it. You don't want the search engines thinking you have duplicate content.

Using javascript rollovers is so 1999. Use CSS instead. What you're hesitant? Why? Not all browsers support it you say? Too bad, they can upgrade. Even still, not everyone has javascript turned on since it's such a security risk...

Something like this should work.

<style type="text/css">

.sw33t {
background-image:url(someimage.jpg);
}

.sw33t:hover {

By most, it's called the "Frame Buster." There are multiple ways to do it. What do they do? Use these snippets of javascript to remove any potential frame your site might be in. Either are viable solutions.

<script type="text/javascript">
if (top.frames.length!=0)
top.location=self.document.location;
</script>

or even

Welcome to our new site SEOCactus.com. Here at SEO Cactus you will find some tools, tips, and tricks to better improve your website(s) within the worlds of Search Engine Optimization and Search Engine Marketing.

Be sure to contact us with any questions you may have.